HarbisonWalker International (HWI) recently announced that Stephen Delo retired as chairman and CEO, effective June 30, 2017. The HWI board of directors elected Carol R. Jackson to be HWI’s next chairman and CEO, effective July 1, 2017.

U.S. Silica Holdings, Inc. recently announced that its board of directors has approved the construction of a new state-of-the-art frac sand mine and plant in West Texas to serve the rapidly growing Permian Basin.